Multipole Susceptibility of Multiorbital Anderson Model Coupled with Jahn-Teller Phonons(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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In order to clarify possible multipole states of Sm-based filled skutterudite compounds, we investigate multipole susceptibility of a multiorbital Anderson model dynamically coupled with Jahn-Teller phonons by using a numerical renormalization group method. Here we take a procedure to maximize the multipole susceptibility matrix to determine the multipole state. When the electron-phonon coupling term is simply ignored, it is found that the dominant multipole state is characterized by 2u octupole for the Γ^-_<67> quartet ground state, while the low-temperature phase is governed by magnetic fluctuations for the Γ^-_5 doublet ground state. When we include the coupling between f electrons in degenerate Γ^-_<67> (e_u) orbitals and Jahn-Teller phonons with E_g symmetry, the mixed multipole state with 4u magnetic and 5u octupole moments is found to be dominant with significant 3g quadrupole fluctuations at low temperatures.
- 社団法人日本物理学会の論文
- 2007-03-15
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